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4. Flow Control
Q: 01 Given:
10. public class Bar {
11. static void foo( int... x ) {
12. // insert code here
13. }
14. }
Which two code fragments, inserted independently at line 12, will allow the class to compile? (Choose
two.)
A. foreach( x ) System.out.println(z);
B. for( int z : x ) System.out.println(z);
C. while( x.hasNext() ) System.out.println( x.next() );
D. for( int i=0; i< x.length; i++ ) System.out.println(x[i]);
Answer: B, D
Q: 02 Click the Task button.
Solution:
int [ ] y={1,2,4,8,16,32};
System.out.print("output : ");
for(int x : y ) {
System.out.println(x);
System.out.println(" ");
Q: 03 Given:
25. int x = 12;
26. while (x < 10) {
27. x--;
28. }
29. System.out.print(x);
What is the result?
A. 0
B. 10
C. 12
D. Line 29 will never be reached.
Answer: C
Q: 04 Given:
11. public static void main(String[] args) {
12. Object obj = new int[] { 1, 2, 3 };
13. int[] someArray = (int[])obj;
14. for (int i : someArray) System.out.print(i + " ");
15. }
What is the result?
A. 1 2 3
B. Compilation fails because of an error in line 12.
C. Compilation fails because of an error in line 13.
D. Compilation fails because of an error in line 14.
E. A ClassCastException is thrown at runtime.
Answer: A
Q: 05 Given:
11. public static void main(String[] args) {
12. for (int i = 0; i <= 10; i++) {
13. if (i > 6) break;
14. }
15. System.out.println(i);
16. }
What is the result?
A. 6
B. 7
C. 10
D. 11
E. Compilation fails.
F. An exception is thrown at runtime.
Answer: E
Q: 06 Given:
11. public static void main(String[] args) {
12. Integer i = new Integer(1) + new Integer(2);
13. switch(i) {
14. case 3: System.out.println("three"); break;
15. default: System.out.println("other"); break;
16. }
17. }
What is the result?
A. three
B. other
C. An exception is thrown at runtime.
D. Compilation fails because of an error on line 12.
E. Compilation fails because of an error on line 13.
F. Compilation fails because of an error on line 15.
Answer: A
Q: 07 Given:
10. public class ClassA {
11. public void count(int i) {
12. count(++i);
13. }
14. }
And:
20. ClassA a = new ClassA();
21. a.count(3);
Which exception or error should be thrown by the virtual machine?
A. StackOverflowError
B. NullPointerException
C. NumberFormatException
D. IllegalArgumentException
E. ExceptionInInitializerError
Answer: A
Q: 08 Given:
35. int x = 10;
36. do { 37. x--;
38. } while (x < 10);
How many times will line 37 be executed?
A. ten times
B. zero times
C. one to nine times
D. more than ten times
Answer: D
9. Given the following code:
public class OrtegorumFunction {
public int computeDiscontinuous(int x) {
int r = 1;
r += x;
if ((x > 4) && (x < 10)) {
r += 2 * x;
} else (x <= 4) {
r += 3 * x;
} else {
r += 4 * x;
}
r += 5 * x;
return r;
}
public static void main(String [] args) {
OrtegorumFunction o = new OrtegorumFunction();
System.out.println("OF(11) is: " + o.computeDiscontinuous(11));
} }
What is the result?
A. OF(11) is: 45
B. OF(11) is: 56
C. OF(11) is: 89
D. OF(11) is: 111
E. Compilation fails.
F. An exception is thrown at runtime.
Answer:
-> E is correct. The if statement is illegal. The if-else-else must be changed to if-else
if-else, which would result in OF(11) is: 111.
-> A, B, C, D, and F are incorrect based on the above. (Objective 2.1)
10. Given:
1. class Crivitch {
2. public static void main(String [] args) {
3. int x = 0;
4. // insert code here
5. do { } while (x++ < y);
6. System.out.println(x);
7. }
8. }
Which, inserted at line 4, produces the output 12?
A. int y = x;
B. int y = 10;
C. int y = 11;
D. int y = 12;
E. int y = 13;
F. None of the above will allow compilation to succeed.
Answer:
-> C is correct. x reaches the value of 11, at which point the while test fails.
x is then incremented (after the comparison test!), and the println() method runs.
-> A, B, D, E, and F are incorrect based on the above.
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